23Feedback
Introduce feedback (referring back, cross-checking) to improve a process or action.• Automatic volume control in audio circuits
• Signal from gyrocompass is used to control simple aircraft autopilots.
• Statistical Process Control (SPC) -- Measurements are used to decide when to modify a process. (Not all feedback systems are automated!)
• Budgets --Measurements are used to decide when to modify a process.
If feedback is already used, change its magnitude or influence.
• Change sensitivity of an autopilot when within 5 miles of an airport.
• Change sensitivity of a thermostat when cooling vs. heating, since it uses energy less efficiently when cooling.
• Change a management measure from budget variance to customer satisfaction.
This principle is proposed to solve the following contradictions:3/23 5/38 6/38 9/30 10/28 13/16 13/37 13/39 16/13 19/11 19/26 20/27 22/7 22/36 22/37 23/1 23/39 24/27 24/39 27/20 27/28 28/27 29/7 29/33 29/38 30/7 30/28 31/9 32/26 33/29 38/4 38/22 38/29 39/23 39/24